Luminous tube



I R. GRANDJEAN Feb. 26, 1929. 1,703,524

LUMINOUS TUBE Filed Aug. 1, 1925 nivzmon RENE GRANDJ EAN 0 BY Assocmrs' A'ITORNEY 30 vention respectively on Fig. 1 and Fig. 2. fixed my signature.

Patent ed Feb. 26, 1929. i 1,703,524

UNITED STATES PATENT OFFICE.

nrmn-emnmmu, or couannvom, nuance, ASSIGNOR, BY m'nsnn ASSIGNMENTS, mo RAINBOW-LIGHT, 1110., or NEW YORK, N. Y., A conronmrrou or new YORK.

LUMINOUS runs.

Application filed August 1, 1925. Serial No. 47,642. 3

Present invention relates to the luminous the tube, 1 is the support of the tube, 2 the tubes used nowadays for advertising and. rear part of said tube covered with the fluochiefly to those wherein a high vacuum is rescent substance, 3 the front part which is kept up and wherein the gaseous fluid not modified and 4 the supporting panel.

5 through which the electric current passes Fig. 2 is a diagrammatical side View of a and which isthus illuminated is evolved by tube according to the second form of exeit bl lt I cution of the invention with its connections.

The object of invention is to produce ,a 2 is a surface covered with the fluorescent novel .lighting eflect by using a fluorescent substance disposed at the rear and close to 40' substance such as zinc sulfide in connection the tube, 5 is the mechanism controlling the I with these tubes. The rear part of the tube periodical interruption of the electric curor a surface in proximity thereof can for inrent, 3 the luminous tube, 10 the electrode stance be covered with said substance and from which the illuminated conducting gasa known device be used for interrupting eous fluid evolves,9 and 9' the dry electrodes,

periodically the electric current and creating 6 the self induction coil used for regulation an alternation between the primary illumipurposes, 7 the transformer, 8 and S'the curnation of the tube and the secondary illumirent terminals.

nation produced by the fluorescent, substance. What I claim is:

Besides the novel efi'ect produced by this al- The combination with a luminous tube 20 ternation of two different lights, another adcontaining a conducting gaseous atmosphere vantage arises through the use of that part to provide a primary source of illumination oi the light which is directed towards the and intended for advertising purposes, of a rear of the tube which would othcrwisebe coating of fluorescent substance located at lost and is accordingto present invention actherearof the tube only to provide a sec- 2 cumulated by the fluorescent substance which ondary source of illumination, and means for gives it up during the extinction of the priinterruptingperiodically the electric current mary light. 1 v so as to permit of alternate illumination from The appended drawings show by way of said prlmary and secondary. sources. example two forms of execution of the 'in- In testimony whereofl have hereunto af- On Fig. 1 which shows a cross section of RENE GRANDJEAN. 

